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From Ted Dunning <tdunn...@maprtech.com>
Subject Re: HBase Stability
Date Mon, 21 Mar 2011 20:24:39 GMT
This rate is dramatically slow than I would suspect.  In our tests, a single
insertion program
has trouble inserting more than about 24,000 records per second, but that is
because we
are inserting kilobyte values and the network interfaces are saturated at
this point.  These
tests are being done using a modified ycsb.  I can't recommend ycsb for any
serious benchmarking,
but it can still be useful.  You might be interested in modeling your
insertion code on the
ycsb insertion code.  You can find the modified ycsb in my github account
at https://github.com/tdunning/YCSB

Ryan has run tests with smaller rows from a number of clients and seen
>150,000 rows/second
insert rate.  This was, I think, done with a map-reduce program but that
should just provide
some parallelism on the driving side.

Can you say more about your data and your insertion program?

On Mon, Mar 21, 2011 at 1:17 PM, Stuart Scott <Stuart.Scott@e-mis.com>wrote:

> The reason I ask is that we have built a 12 data-node cluster, with
> region servers, zoo keeper etc.. When we add a few million rows via the
> Java APIs, the system periodically fails. Regions go-off line,
> performance slows down dramatically from 1000 inserts per second to
> under 200 per second. It just has a generally feeling of instability. We
> have rebuilt the system several times. We have changed the write-buffer
> sizes, added more memory, added periodical flushing of the tables etc..
>

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